The prime murder suspect is alleged to have threatened to kill his friend while grabbing her by the neck and shoving her into an elevator on the last day Miss Gardner was seen alive.

Prime suspect: Giordano, covering his head while being led to jail from a police station on August 15, is the only suspect in the case

Boyfriend: Richard Forester, right, said he received a text from his girlfriend on the day she disappeared telling him she loved him

Prosecutors need more evidence to charge him, but witnesses have come forward to claim he was sweating profusely on that August 2 day, with blood next to him on the beach and a large scratch mark on his throat.

His father, Frank Giordano has said his son is a 'not a monster' but a 'good human being, who is good to his family'.

Gardner's boyfriend Richard Forester, 40, said the couple had a row before she left for Aruba.

Giordano is said to have read a text on Miss Gardner's phone, in which she wrote to her boyfriend back home: 'I love you. I care about you. We'll sort this out when I get back.'

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Hunt for Robyn Gardner's body steps up as cadaver dogs arrive in Aruba to look for her remains